Egyptian authorities have ordered the detention of Suzanne Mubarak, wife of deposed president Hosni Mubarak, according to the government-run MENA news service.
The move comes a day after the government reported that Mr Mubarak and his wife were questioned over suspicions they illegally amassed vast wealth.
MENA said prosecutors ordered Mrs Mubarak detained for 15 days pending further investigation of the allegations.
The 82-year-old former president is in a hospital in the Sinai resort of Sharm el-Sheikh.
He has been questioned several times, but Thursday was the first time his wife faced interrogation.